"Legends tell of a great battle that took place in this very vale, turning the golden fields to crimson with the blood of many brave monks. The armies of Lei Shen of Thunder King, emperor of the mogu, fought brutally, but were eventually overcome.
For days following the fall of Lei Shen, the vale was shrouded in a cloud of the deepest black. Summoned by Lei Shen in his final moments, the otherworldly storm blanketed the vale with rainfall and struck jagged spears of lightning into the hills."

The rest of what he says only refers to Alani. Unless i'm reading this incorrectly, it states his armies were defeated by monks... nothing about Lei Shen being defeated in battle by monks. Nothing has really specified what killed him, or how he was killed.

Ya know, thinking about it, the ability in Phase 3 where Lei Shen absorbs ALL of the energy in the Thunder Palace makes me think of Enel in One Piece, when he sits on the Arc and it just surges and crackles with lightning.

Ya know, thinking about it, the ability in Phase 3 where Lei Shen absorbs ALL of the energy in the Thunder Palace makes me think of Enel in One Piece, when he sits on the Arc and it just surges and crackles with lightning.